Eraser attachment for pencils



W. l. CAMPBELL.

ERASER ATTACHMENT FOR PENCILS. APPLICATION FILED MAR 29, i920.

1,353,2 1 5, PatentedSept. 21, 1920.

- Swmwboz Vfl/Mm JCam be/ .UNITED STATES PATENT OFFICE.

WILLIAM J. CAMPBELL, OF INDIANAPOLIS, INDIANA.

ERASER, ATTACHMENT FOR PENGILS.

Specification of Letters Patent.

Patented Sept. 21, 1920.

Application filed March 29, 1920. Serial No. 369,738.

section of lead and to present the same progressively for use as the same wears. This article is provided at its upper end with a removable cap which covers and protects a short section of eraser which soon wears out and is not readily replaceable.

The object of my present invention is to provide a neat and efficient attachment which may be readily applied to the upper end of a pencil of this kind and which will hold a short cylindrical section of eraser in such manner that it may be readily adjusted as it wears and readily replaceable in the course of time. I

l/Vhile the device has been primarily designed for attachment to the so-called Ever Shar pencil, it will be readily understood t at with slight modifications which will be apparent to any skilled mechanic, the attachment may be applied to an ordinary wooden pencil, or pencils of other types.

The accompanying drawings illustrate my invention. Figure 1 is a side elevation of an Ever Sharp pencil to which my device has been applied; Fig. 2 is an enlarged section of my device shown in position upon an Ever Sharp pencil; Fig. 3 a side elevation of the main body of my device; and Fig. 4 a plan of the part shown in Fig. 3.

My device comprises a'main metal shell 10, having a threaded shank 11. The lower end of the shell is slit longitudinally at various circumferentially spaced points, as

indicated at 12, and this lower end is formed with an inturned gripping edge 13 and a shoulder 1 1, in the present instance being formed so as to grip the circumferential rib 15 found upon an Ever Sharp pencil,

the shoulder 14: lying squarely upon the upper end of the pencil, as shown in Fig. 2, so as to stabilize the body 10 upon the pencll body 16. The bore ofthe shell IO-iscylmdrical and of a size to fit a'cylindricalsection of eraser 17, eraser material of this 7 form being readily procurable inthe market.

Threaded upon threads 11 is a clamping sleeve 18 provided at its lower end with a conical seat 19 adapted to coact with the conical flaring portion 20 of shell 10.

When the clamping sleeve 18 is unscrewed to some extent upon threads 11, the gripping fingers of shell 10, formed by the slits 12, may be-snapped over the rib 15, whereupon the clamping sleeve 18 may be screwed down so as to bring its tapered seat 19 against the tapered shoulder 20' of the gripping fingers and thus compress said fingers around the rib l5 and at the same tlme compress the fingers upon the lower end of the eraser 17.

l/Vhen the clamping sleeve 18 is slightly loosened on shell 10, the eraser'l? may be axially adjusted to any desired point.

It will be readily seen that by proper modification of the inner surfaces of the lower ends of the gripping fingers of shell 10, the device may be formed for engagement with'the upper end of any desired form of pencil.

Iclaimr 1. As anarticle of manufacture, an eraser attachment for pencils, comprising a-tubular body adapted to receive a section of eraser material, gripping fingers carried by the lower end of said body and forming part of the eraser receiving bore, and a clamping sleeve threaded upon'said body, the clamping sleeve and fingers having coacting surfaces by which the fingers may be contracted upon the upper end of. a pencil and upon the eraser material. 1

2. As an article of manufacture, an eraser attachment for pencils, comprising a tubular 'body longitudinally s'litted at one end to form gripping fingers, a clamping sleeve threaded on the tubular body, and interacting cam portions on the sleeve and fingers for contracting the fingers and the bore. 7

3. As an article of manufacture, an eraser attachment for pencils, comprising a tubu-' lar body longitudinally 'slitted at one end to form gripping fingers, a shouldered gripday of March, A. one thousand nine hun dred and twenty.

LLIAM J. CAMPBELL. 

